Open redirect in Japan Total System Co.,Ltd. GroupSession Free edition, GroupSession…
Priority LOW 29CWE-601Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Spoofing
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-601.
Summary
Open redirect vulnerability in GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier allows a remote unauthenticated attacker to redirect users to arbitrary web sites and conduct phishing attacks by having a user to access a specially crafted URL.
Why it matters now
EPSS 0.00847 58th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Japan Total System Co.,Ltd. | GroupSession Free edition, GroupSession byCloud, GroupSession ZION | GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier | — | No fix listed | CNA |
- GroupSession Free edition, GroupSession byCloud, GroupSession ZION VendorJapan Total System Co.,Ltd. Affected GroupSession Free edition ver5.1.1 and earlier, GroupSession byCloud ver5.1.1 and earlier, and GroupSession ZION ver5.1.1 and earlier Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:groupsession:groupsession:*:*:*:*:cloud:*:*:* | up to 5.1.1 | Vulnerable | Japan Total System Co.,Ltd. |
| cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:* | up to 5.1.1 | Vulnerable | Japan Total System Co.,Ltd. |
| cpe:2.3:a:groupsession:groupsession:*:*:*:*:zion:*:*:* | up to 5.1.1 | Vulnerable | Japan Total System Co.,Ltd. |
- cpe:2.3:a:groupsession:groupsession:*:*:*:*:cloud:*:*:* Versions up to 5.1.1 Vulnerable ·Japan Total System Co.,Ltd.
- cpe:2.3:a:groupsession:groupsession:*:*:*:*:free:*:*:* Versions up to 5.1.1 Vulnerable ·Japan Total System Co.,Ltd.
- cpe:2.3:a:groupsession:groupsession:*:*:*:*:zion:*:*:* Versions up to 5.1.1 Vulnerable ·Japan Total System Co.,Ltd.
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-20875
- 2026-10-03 Alias added: GHSA-vj52-jgg8-wg96
References
More Japan Total System Co.,Ltd. Groupsession vulnerabilities
- TI-2021-04088 Incorrect permission assignment in Japan Total System Co.,Ltd. GroupSession Free edition… CVSS 3.1HIGH 7.5
- TI-2025-38316 GroupSession Free edition prior to ver5.3.0, GroupSession byCloud prior to ver5.3.3, and… CVSS 4.0MEDIUM 6.9
- TI-2021-04090 Path traversal in Japan Total System Co.,Ltd. GroupSession Free edition, GroupSession… CVSS 3.1MEDIUM 6.8
- TI-2017-01466 Information disclosure in Japan Total System Co.,Ltd. GroupSession CVSS 3.0MEDIUM 6.5
- TI-2025-38294 Authorization bypass in Japan Total System Co.,Ltd. GroupSession Free edition CVSS 4.0MEDIUM 5.3
- TI-2021-04015 Open redirect in Japan Total System Co.,Ltd. GroupSession CVSS 3.1MEDIUM 6.1
Sources
- CVE-2021-20875 · CVE Program
- CVE-2021-20875 · NVD
- FIRST EPSS
- GHSA-vj52-jgg8-wg96 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences